Revolving-knife harrow and pulverizer.



W. W. JACKSON, DECD. L. moxson, ADMINISTRATRIX; REVOLVING KNIFE HARROW AND PULVERIZER. APPLIOATION FILED AUG. 21, 1908. RENEWED DBO. 14, 1912.

1,082,749. Patented Dec. 30, 1913.

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WILLIAM W. JACKSON, OF DENVER, COLORADO; LILLUS JACKSON, ADMINISTRATR-IX OF SAID WILLIAM W. JACKSON, DECEASED, ASSIGNOR OF ONE-THIRD TO COR- RIN'lI-IA J. MADDUX, OF DENVER, COLORADO.

REVOLVING-KNIFE HARROW AND PULVEBIZER.

Specification of Letters Patent.

Patented Dec. 30, 1913.

Application filed August 21, 1908, Serial No. 449,619. Renewed December 14, 1912. Serial No. 736,826.

1 '0 all whom it may concern Be it known that I, WILLIAM W. J AOKSON, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Revolving-Knife Harrows and Pulverizers; and I do declare the following to be a full, clear, and exact descrip tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in tools for harrows and it consists of cutters having spirally arranged blades, said cutters being mounted to rotate upon a longitudinal axis or an axis in line with the direction of the machines travel. These cutters rotate in response to the resistance offered by the ground which they engage. They may be located either singly or in sets upon the frame work of a machine and they may be acted upon by springs having a tendency to force them downwardly into the earth causing them to engage the same to a suitable depth to perform the pulverizing function. The individual blades of each revolving cutter diminish in width from the rear toward the front forming a device of the general shape of a cone having its point or smaller extremity foremost when the machine is in use.

Among the objects of the invention are, to provide a cutter which shall be strong and durable and cheap to manufacture and so built that when any one knife is broken that knife may be replaced by a new one.

@ther objects will appear as I proceed with the description of that embodiment of the invention which for the purposes of the present application is illustrated in the accompanying drawing in which:

Figure 1 is a side elevational view of a cutter built in accordance with my invention, a portion of a frame in which it is mounted being shown also. Fig. 2 is a rear elevational view of the cutter alone, or a view looking in the direction of arrow 2, Fig. 1. Fig. 3 is a view similar to Fig. 2 but showing one blade only.

Similar reference characters refer to like parts throughout the views.

In the drawing, 5 refers to a support or frame of the sort which I prefer to employ, it being provided with a forwardly extending arm 6 which may be attached to a vehicle frame (not shown) preferably by being pivotally supported at its forward extremity in order to give the cutter freedom of vertical motion.

7 is an upstanding lug that may be employed to receive one end of a spring (not shown) or other flexible connection by means of which the cutter is held to its work. It should be understood however, that means of this nature are not positively essential since the cutter may if desired, be made sufficiently heavy to accomplish the same result without any positive means for holding it down.

Depending arms 8 and 9 rotatably receive the small ends 10 and 11 of a shaft 12. Upon the latter are mounted blades 13. It will of course, be understood that I do not care to limit myself in this particular, but I have discovered through experiment that four blades will do the work in a very satisfactory manner. These blades 13 are spiral as shown and diminish gradually in width from the rear to the forward extremity of the cutter where they have virtually no width but merge into the shaft. Each blade is provided with a flange 14 curved to fit closely against the shaft 12, these flanges being spiral and of a constant width from front to rear, their width in the construction illustrated being equal to one-fourth of the circumference of the shaft. here a different number of blades is used the width of the flanges will difler correspondingly in order to completely inclose the shaft when the blades are assembled. Each flange is secured upon the shaft by means of any suitable fastening. For this purpose I have illustrated a series of screws 15.

Having thus described my invention, what I claim is:

A revolving cutter composed of a shaft and a number of distinct spirahshaped blades, each of the said blades having a laterally extending flange curved to fit the shaft in the direction in which the shaft extends, the said flange covering the entire longitudinal surface of the shaft between any two adjacent blades, the said flange of each blade 10 being fixedly secured to the shaft, substantially as described.

I11 testimony whereof I aflix my signature 'n presence of two witnesses.

WILLIAM W. J AGKSON. Witnesses:

A. J. OBRIEN,

ALODIA HU'rcHIsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

